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Sensors 2016, 16(11), 1839; doi:10.3390/s16111839

A Stretchable Radio-Frequency Strain Sensor Using Screen Printing Technology

School of Electrical and Electronics Engineering, College of Engineering, Chung-Ang University, 221 Heukseok-dong, Dongjak-gu, Seoul 156-756, Korea
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Academic Editor: Vittorio M. N. Passaro
Received: 13 September 2016 / Revised: 25 October 2016 / Accepted: 31 October 2016 / Published: 2 November 2016
(This article belongs to the Section Physical Sensors)
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Abstract

In this paper, we propose a stretchable radio-frequency (RF) strain sensor fabricated with screen printing technology. The RF sensor is designed using a half-wavelength patch that resonates at 3.7 GHz. The resonant frequency is determined by the length of the patch, and it therefore changes when the patch is stretched. Polydimethylsiloxane (PDMS) is used to create the substrate, because of its stretchable and screen-printable surface. In addition, Dupont PE872 (Dupont, NC, American) silver conductive ink is used to create the stretchable conductive patterns. The sensor performance is demonstrated both with full-wave simulations and with measurements carried out on a fabricated sample. When the length of the patch sensor is increased by a 7.8% stretch, the resonant frequency decreases from 3.7 GHz to 3.43 GHz, evidencing a sensitivity of 3.43 × 107 Hz/%. Stretching the patch along its width does not change the resonant frequency. View Full-Text
Keywords: stretchable dielectric material; stretchable conductive ink; PDMS; stretchable RF resonator stretchable dielectric material; stretchable conductive ink; PDMS; stretchable RF resonator
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Jeong, H.; Lim, S. A Stretchable Radio-Frequency Strain Sensor Using Screen Printing Technology. Sensors 2016, 16, 1839.

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